Use __ROMSTAGE__ to denote romstage

There were some remaining places that used __PRE_RAM__ for
romstage, while it really means 'bootblock or romstage'.

Change-Id: Id9ba0486ee56ea4a27425d826a9256cc20f5b518
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10020
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
diff --git a/src/include/rules.h b/src/include/rules.h
index 3f5262c..1a27fc6 100644
--- a/src/include/rules.h
+++ b/src/include/rules.h
@@ -31,7 +31,7 @@
 #define ENV_SECMON 0
 #define ENV_VERSTAGE 0
 
-#elif defined(__PRE_RAM__)
+#elif defined(__ROMSTAGE__)
 #define ENV_BOOTBLOCK 0
 #define ENV_ROMSTAGE 1
 #define ENV_RAMSTAGE 0